I tried googling boxing in stairwell with wood, any idea where to find some handy guides on it? Should I just use concrete screws to attach the wood to the side? And put some bumpers on the topside?

Meaning, better not giving it a go DIY if I never did this before? It doesn't need to look immaculate imo, just better than now. Because I don't have much budget and nowadays it takes a lot of money and months before I can get a construction worker.